CHAPTER 1 Introduction to Computers 3. The Components of a Computer

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1、Chapter1IntroductiontoComputersTheComponentsofaComputerInputDevicesAninputdeviceisanyhardwarecomponentthatallowsyoutoenterdataandinstructionsontoacomputer.SixWidelyusedinputdevicesarethekeyboard,mouse,microphone,scanner,digitalcameraandPCvideocamera.OutputDevicesAnoutputdevice

2、isanyhardwarecomponentthatconveysinformationtooneormorepeople.Threecommonlyusedoutputdevicesareaprinter,amonitorandspeakers.InputandOutputDevicesDataentryTheprocessbywhichhuman-readabledataisconvertedintoamachine-readableform.DatainputTheprocessoftransferringmachine-readableda

3、taintothecomputersystem.SourcedataautomationCapturingandeditingdatawherethedataisoriginallycreatedandinaformthatcanbedirectlyinputtoacomputerInputDevicesPCinputdevicesVoicerecognitiondevicesDigitalcomputercamerasTerminalsScanningdevicesOpticaldatareadersMagneticInkCharacterRec

4、ognition(MICR)PointOfSale(POS)devicesAutomaticTellerMachine(ATM)PeninputdevicesLightpensTouchsensitivescreensBarcodescannersAPCEquippedwithaComputerCameraOutputDevicesDisplaymonitorsLiquidCrystalDisplays(LCDs)PrintersandplottersComputerOutputMicrofilm(COM)SystemUnitAsystemunit

5、isthepartofacomputerthathousestheprimarydevicesthatperformoperationsandproduceresultsforcomplexcalculations.Itincludesthemotherboard,CPU,RAMandothercomponents,aswellasthecaseinwhichthesedevicesarehoused.Thisunitisalsoknownasachassisoratowerinlayman'sterms,anditperformsthemajor

6、ityofthefunctionsthatacomputerisrequiredtodo.StoragedeviceAstoragedeviceisadeviceforrecording(storing)information(data).Recordingcanbedoneusingvirtuallyanyformofenergy,spanningfrommanualmusclepowerinhandwriting,toacousticvibrationsinphonographicrecording,toelectromagneticenerg

7、ymodulatingmagnetictapeandopticaldiscs.flashdiskcompactdiskCommunicationdeviceAcommunicationdeviceisahardwaredevicecapableoftransmittingananalogordigitalsignaloverthetelephone,othercommunicationwire,orwirelessly.ThebestexampleofacommunicationdeviceisacomputerModem,whichiscapab

8、leofsendingandreceivingasignaltoallowcomputerstotalktootherco